Hook device and crane
The hook device with dual stoppers enhances work efficiency by preventing rope disengagement and maintaining a wide opening for easy rope handling, addressing the inefficiencies of multiple-latch designs.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- SUMITOMO HEAVY IND CONSTR CRANES CO LTD
- Filing Date
- 2024-12-18
- Publication Date
- 2026-06-30
AI Technical Summary
Existing hook devices with multiple safety latches reduce work efficiency due to difficulty in passing and securing lifting wire ropes, as they narrow the hook opening and require both hands to press down on the latches.
A hook device with a first stopper to prevent outward movement and a second stopper that rotates to prevent inward movement, allowing the second stopper to be held in place without additional manual pressure, thereby maintaining a wide opening for easy rope attachment and detachment.
The solution suppresses the 'puzzle-like' phenomenon of ropes coming off the hook and improves workability by allowing easy attachment and detachment of ropes without narrowing the hook opening.
Smart Images
Figure 2026106745000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a hook device and a crane.
Background Art
[0002] Generally, a hook is installed on the wire rope of a crane. For example, by hanging a sling wire rope attached to a lifting object on the hook, the load can be lifted. The hook is provided with a hook-shaped hook and a detent for opening and closing the hook opening. The detent is generally rotatably supported at the base end of the hook, and one end thereof is biased so as to be pressed against the inside of the tip side of the hook body. Conventionally, when the sling wire rope sags and a movement called the wisdom ring phenomenon occurs in the sling wire rope, it is known that the sling wire rope can come off the hook even with a hook having a detent. The wisdom ring phenomenon is also called the through phenomenon.
[0003] Patent Document 1 describes a configuration for suppressing the occurrence of the above-mentioned wisdom ring phenomenon by providing a main detent and a sub-detent on the hook.
Prior Art Documents
Patent Documents
[0004]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0005] As described in Patent Document 1, by providing two safety latches on the hook, the occurrence of the "puzzle" phenomenon can be suppressed even when the lifting wire rope is slack. However, regardless of the technology in Patent Document 1, the presence of two safety latches presents a problem in that it reduces the work efficiency for workers when attaching the lifting wire rope to the hook. For example, the two safety latches narrow the opening of the hook, making it difficult to pass the lifting wire rope through. Also, if it is necessary to press down on the two safety latches when attaching the lifting wire rope to the hook, it becomes difficult to firmly hold the very heavy lifting wire rope with both hands, reducing work efficiency.
[0006] The present invention aims to provide a hook device and a crane that can suppress the occurrence of the puzzle-like phenomenon of ropes being hooked onto a hook and improve the workability when attaching a rope to a hook. [Means for solving the problem]
[0007] A hook device according to one embodiment of the present invention is A hook body having a first part, a hanging portion on which a rope is attached, a hook opening through which the rope is passed from the outside to the hanging portion, and a second part located on the opposite side of the first part, with the hook opening in between. A first stopper capable of preventing the rope from moving outward from the hanging portion when positioned at the hook opening, A second stopper capable of preventing the rope from moving from the outside to the hanging portion when positioned at the hook opening, Equipped with, When one of the hook tip and the hook base is referred to as the first part, and the other as the second part, The second stopper is such that the second stopper end, which is one end in the longitudinal direction, is movable from the side closer to the first part, passing on the opposite side of the hook, and approaching the second part. Furthermore, The device includes a retaining portion capable of holding the second retaining end when it is close to the second portion.
[0008] A crane according to one aspect of the present invention is It has the above-mentioned hook device. [Effects of the Invention]
[0009] According to the present invention, it is possible to suppress the occurrence of the puzzle-like phenomenon of ropes being hung on a hook, and to improve the workability when hanging a rope on a hook device. [Brief explanation of the drawing]
[0010] [Figure 1] These are a side view (a) and a front view (b) showing a hook device according to Embodiment 1 of the present invention. [Figure 2] These are enlarged side views (a) and enlarged front views (b) showing the first and second retaining elements in detail. [Figure 3] This is a side view showing the state in which the second stopper in Figure 1 is held in a position that opens the hook opening, and the first stopper is also opening the hook opening. [Figure 4] Figure 1 is a side view showing the state in which the second retaining arm is held in a position that opens the hook opening, and the first retaining arm is closed. [Figure 5] These are a side view (a) and an enlarged front view (b) showing a hook device according to Embodiment 2 of the present invention. [Figure 6] This figure shows a crane according to an embodiment of the present invention. [Modes for carrying out the invention]
[0011] Hereinafter, each embodiment of the present invention will be described in detail with reference to the drawings.
[0012] (Embodiment 1) FIG. 1 is a side view (a) and a front view (b) showing the hook device of Embodiment 1 of the present invention. FIG. 2 is an enlarged side view (a) and an enlarged front view (b) showing in detail the portions of the first anti-disengagement member and the second anti-disengagement member. FIG. 3 is a side view showing a state in which the second anti-disengagement member is held at a position where it opens the hook opening, and the first anti-disengagement member opens the hook opening. FIG. 4 is a side view showing a state in which the second anti-disengagement member is held at a position where it opens the hook opening, and the first anti-disengagement member closes the hook opening.
[0013] The hook device 1 of Embodiment 1 is a device for hanging a suspended object via a wire W such as a ball-hanging wire rope (specifically, the eye portion of the wire W). The wire W corresponds to an example of the rope according to the present invention. The hook device 1 is connected to, for example, a wire rope W100 (see FIG. 6) that is wound up and lowered in a crane, and is moved up and down.
[0014] The hook device 1 has a hook body 10 having a hanging portion 12 on which the wire W is hung, a first anti-disengagement member 20 that can prevent the wire W from moving outward from the hanging portion 12, and a second anti-disengagement member 30 that can prevent the wire W from moving from the outside to the hanging portion 12 side.
[0015] The hook body 10 includes a hook tip portion (corresponding to the first portion) 11, a hanging portion 12 on which the wire W is hung, a hook opening 13 through which the wire W is passed from the outside to the hanging portion 12, and a hook base portion (corresponding to the second portion) 14 located on the opposite side of the hook tip portion 11 across the hook opening 13. The hook base portion 14 is connected to, for example, a wire rope W100 (see FIG. 6) and is supported by a crane via the wire rope W100. The hook body 10 has a shape that is curved in an arc shape except for a partial angular range around a cavity portion. The above-mentioned cavity portion corresponds to the hanging portion 12, and the above-mentioned partial angular range corresponds to the hook opening 13.
[0016] The first detent 20 is supported in a movable state on the hook base 14 and prevents the wire W from moving outward from the hanging portion 12 when it is located at the hook opening 13. Of the first detent 20, the end farther from the support portion is denoted as the first end portion (corresponding to the "first detent end portion" according to the present invention) 21.
[0017] The first detent 20 is a member long on one side and is rotatably supported by a joint portion 141 provided on the hook base 14. Specifically, the rotation shaft 28 is passed through the shaft holes provided in the joint portion 141 and the first detent 20 so as not to come out, enabling the above rotation. The joint portion 141 is provided so as to project from the hook base 14 toward the hook tip portion 11 side. By providing the joint portion 141 so as to project, the rotation range when pushing the first detent 20 toward the hook base 14 can be increased. Note that the joint portion 141 and the rotation shaft 28 may be integrally formed.
[0018] The first detent 20 is rotatable from the hook opening 13 toward the hanging portion 12 side, while rotation to the opposite side of the hanging portion 12 is restricted. The restriction of the rotation is realized by a configuration in which the first end portion 21 abuts against the hook tip portion 11. That is, the hook tip portion 11 serves as a stopper that restricts the rotation of the first detent 20 at the hook opening 13. Note that a stopper for restricting rotation may be provided similarly at other portions such as the joint portion 141.
[0019] A spring (such as a torsion spring), not shown, for biasing the first detent 20 toward the hook opening 13 side is provided on the joint portion 141. By this spring, the first detent 20 is located at the hook opening 13 in a state where no force is applied, and by applying a force toward the hanging portion 12 side, it can rotate toward the hanging portion 12 side and open the hook opening 13.
[0020] The second stopper 30 is a long member supported in a movable state, and when positioned in the hook opening 13, it prevents the wire W from moving from the outside to the hook portion 12. The end of the second stopper 30 that is farther from the support portion is referred to as the second end (corresponding to the "second stopper end" according to the present invention) 31.
[0021] The second retaining arm 30 is rotatably supported by a joint portion 24 provided on the first retaining arm 20. Specifically, the pivot shaft 38 is passed through a shaft hole provided in the joint portion 24 and the second retaining arm 30 in a way that prevents it from coming out, thereby enabling the above rotation. The joint portion 24 is provided to protrude from the first retaining arm 20 in the direction of rotation of the first retaining arm 20 (a direction perpendicular to the longitudinal direction). That is, when the first retaining arm 20 is positioned at the hook opening 13, the joint portion 24 is provided to protrude toward the hook tip portion 11 than the connection portion between the first retaining arm 20 and the hook base portion 14. The protruding joint portion 24 allows for a larger range of rotation when the second retaining arm 30 is rotated away from the hook tip portion 11. The joint portion 24 and the pivot shaft 38 may be integrated.
[0022] The second retainer 30 is capable of rotating from the hook opening 13 toward the opposite side of the hook portion 12, while rotation toward the hook portion 12 is prevented. This prevention of rotation is achieved by the configuration in which the second end portion 31 abuts against the hook tip portion 11. In other words, the hook tip portion 11 acts as a stopper that prevents the rotation of the second retainer 30 at the hook opening 13. In addition, stoppers to similarly prevent rotation may be provided at other parts such as the joint portion 24.
[0023] <Holding parts 40, 41 of the second stopper 30> As shown in Figure 3, the hook device 1 further includes a holding part 40 capable of holding the second stopper when the second end portion 31 is close to the hook base portion 14, and a holding part 41 capable of holding the second stopper when the second end portion 31 is close to the hook tip portion 11, as shown in Figure 2. The holding parts 40 and 41 are configured to include pin holes H31, H32, and H21 provided in the second stopper portion 30 and the first stopper portion 20, respectively, and a detachable pin P1. As described above, as the second stopper portion 30 rotates, the second end portion 31 moves from the side closer to the hook tip portion 11, passing on the opposite side of the hook portion 12 and approaching the hook base portion 14.
[0024] The pin hole H21 is provided in the first retainer 20. The pin holes H31 and H32 are provided in the second retainer 30. The pin hole H21 is located on the pivot axis 28 side of the joint portion 24. The pin hole H21 is provided in the portion of the first retainer 20 that protrudes in the rotational direction (referred to as the protruding portion 27), similar to the joint portion 24.
[0025] The pin hole H31 is positioned so that the second end portion 31 is close to the hook base portion 14 and overlaps with the pin hole H21 (see Figure 3). The pin hole H32 is positioned so that both the first end portion 21 and the second end portion 31 are close to the hook tip portion 11 and overlap with the pin hole H21 (see Figure 2(a)).
[0026] As shown in Figures 2(a) and (b), the pin P1 is passed through the pin hole H21 of the first retainer 20 and the pin hole H32 of the second retainer 30, which are stacked on top of each other, and is fixed so that the pin P1 does not come out, thereby holding the second retainer 30 in a position where it is located in the hook opening 13. At this time, the first end 21 and the second end 31 are positioned so as to be in substantially contact with the hook tip 11 from opposite sides, and the first retainer 20 and the second retainer 30 are fixed relative to each other via the pin P1. Therefore, no matter what direction of force is applied to the first retainer 20 and the second retainer 30, the rotation of both the first retainer 20 and the second retainer 30 is prevented.
[0027] On the other hand, as shown in Figures 3 and 4, the pin P1 is passed through and fixed in the pin holes H21 of the first retainer 20 and H31 of the second retainer 30, which are stacked on top of each other, so that the second retainer 30 is held away from the hook tip 11. Furthermore, in this state, the second retainer 30 does not come into contact with the hook body 10. Therefore, the first retainer 20 is rotatable from a position that closes the hook opening 13 as shown in Figure 4 to a position that opens the hook opening 13 as shown in Figure 3, while holding the second retainer 30.
[0028] Furthermore, the pin holes H21, H31, and H32 constituting the retaining parts 40 and 41 are not limited to the above examples. For example, the first stopper 20 may have two pin holes while the second stopper 30 has one pin hole, and in each of the two configurations of the second stopper 30—one close to the hook tip 11 and one far away—the pin holes of the first stopper 20 may overlap with the pin holes of the second stopper 30. Alternatively, the first stopper 20 may have two pin holes while the second stopper 30 has two pin holes, and in each of the two configurations of the second stopper 30, the pin holes of the first stopper 20 may overlap with the pin holes of the second stopper 30.
[0029] <Relative positional relationship between the first stopper 20 and the second stopper 30> As shown in Figure 3, in the fully open state where both the first stopper 20 and the second stopper 30 are open to the hook opening 13, the second stopper 30 is in the longitudinal direction of the first stopper 20. The second retainer 30 is located in region R1 opposite to the hook portion 12, beyond the range of the first end portion 21 side 1 / 3. More preferably, the second retainer 30 may be configured to be located in region R2 opposite to the hook portion 12, beyond the range of the first end portion 21 side 1 / 2. The above-mentioned "fully open state" means a state in which both the first end portion 21 and the second end portion 31 are close to the hook base portion 14.
[0030] By positioning the second stopper 30 in the above-mentioned region R1 or R2, the spacing of the hook openings 13 can be widened. This is because, when the first stopper 20 opens the hook opening 13, the 1 / 3 or 1 / 2 of the hook opening 13 on the first end 21 side is closest to the hook tip 11. Therefore, if the second stopper 30 is located in this range, the gap between the hook openings 13 will be narrowed by the second stopper 30. On the other hand, by positioning the second stopper 30 as described above, the narrowing of the spacing as described above can be avoided, and the gap between the hook openings 13 can be widened. Therefore, the workability when passing the wire W through the hooking portion 12 can be improved.
[0031] As shown in Figure 3, in the fully open state where both the first stopper 20 and the second stopper 30 are open to the hook opening 13, the minimum distance L1 between the first stopper 20 and the hook tip 11 is greater than the minimum distance L2 between the second stopper 30 and the hook tip 11. This relationship between the minimum distances L1 and L2 can be easily achieved by arranging the second stopper 30 as described above.
[0032] The pivot axis 38 of the second retaining arm 30 is located in the longitudinal direction of the first retaining arm 20, on the side opposite the first end 21 to the halfway point of the first retaining arm 20. This arrangement makes it easy to realize the arrangement of the second retaining arm 30 in the fully open state described above.
[0033] As mentioned above, the joint portion 24 of the first stopper 20 (the portion to which the second stopper 30 is rotatably supported) is provided protruding from the opposite side of the hook base 14. With this configuration, when the second stopper 30 is rotated so that the second end portion 31 approaches the hook base 14, the amount of rotation can be increased. Therefore, it becomes possible to bring the second stopper 30 closer to the hook base 14, and even outside the hook opening 13, the obstruction of the wire W by the second stopper 30 when passing the wire W through the hook opening 13 can be reduced.
[0034] <How to use the hook device> To attach the wire W to the hook device 1, first, as shown in Figure 4, the worker uses the pin P1 to hold the second retainer 30 in the flipped-up position with the second retainer 30 flipped up. Then, as shown in Figure 3, the hook opening 13 can be opened by pushing the first retainer 20 against the spring force. At this time, since the relative position of the second retainer 30 is maintained, there is no need to separately press down on the second retainer 30. Furthermore, due to the arrangement of the second retainer 30 as described above, the hook opening 13 is not narrowed by the second retainer 30.
[0035] Therefore, when a worker moves, for example, the wire W to the hook opening 13, and the wire W pushes the first stopper 20, the first stopper 20 rotates, allowing the wire W to enter the hooking part 12. After that, the first stopper 20 returns to the position (position in Figure 4) where it closes the hook opening 13 due to spring force. Then, the worker removes the pin P1 and rotates the second stopper 30 so that the second end 31 approaches the hook tip 11, moving the second stopper 30 to the position (position in Figure 1(a)) where it closes the hook opening 13. Then, the worker uses the pin P1 to hold the second stopper 30 in that position. As a result, the wire W does not come out of the hooking part 12, and a part of the slack wire W does not enter the hooking part 12 from the outside. Therefore, the puzzle-like phenomenon does not occur. It can be suppressed.
[0036] When removing the wire W attached to the hook device 1, the same procedure as when attaching the wire W is followed to bring it to the state shown in Figure 4. Then, the first stopper 20 is pushed in manually or by other means to open the hook opening 13 as shown in Figure 3. At this time, the second stopper 30 does not narrow the hook opening 13 due to its arrangement. Furthermore, the worker does not need to separately hold down the second stopper 30. Therefore, the worker can remove the wire W from the attachment part 12 through the hook opening 13 with good workability.
[0037] As described above, according to the hook device 1 of Embodiment 1, the first stopper 20 prevents the wire W from coming off the hook device 1. Furthermore, the second stopper 30 prevents the "puzzle" phenomenon from occurring even if slack occurs in the wire W hooked on the hook device 1. Moreover, according to the hook device 1 of Embodiment 1, the second stopper 30 is movable so as to spring up, and the second end 31 of the second stopper 30 can be held in a state where it is close to the hook base 14. Therefore, when attaching or detaching the wire W to the hook device 1, the worker does not need to press down on the second stopper. Furthermore, the narrowing of the hook opening 13 by the second stopper 30 can be reduced. Therefore, the worker can attach and detach the wire W to the hook device 1 with good workability.
[0038] Furthermore, according to the hook device 1 of Embodiment 1, when the first retainer 20 and the second retainer 30 are fully open, the second retainer 30 is located on the opposite side of the hook portion 12 from the first end 21 side 1 / 3 of the longitudinal direction of the first retainer 20. Therefore, it is possible to reduce the narrowing of the hook opening 13 by the second retainer 30 when attaching or detaching the wire W. Thus, workers can attach and detach the wire W to the hook device 1 with good workability.
[0039] Furthermore, according to the hook device 1 of Embodiment 1, when the first stopper 20 and the second stopper 30 are fully open, the minimum distance between the second stopper 30 and the hook tip 11 is greater than the shortest distance between the first stopper 20 and the hook tip 11. Therefore, the second stopper 30 does not narrow the hook opening 13. Thus, workers can attach and detach the wire W to the hook device 1 with better work efficiency.
[0040] Furthermore, according to the hook device 1 of Embodiment 1, the second retainer 30 is rotatably supported on the first retainer 20 via a pivot shaft 38, the pivot shaft 38 being located on the opposite side of the first end 21 from the longitudinal half of the first retainer 20. This arrangement of the pivot shaft 38 makes it easy to achieve an arrangement in which the second retainer 30 does not narrow the hook opening 13 when the second retainer 30 opens the hook opening 13.
[0041] (Embodiment 2) Figure 5 shows a side view (a) and an enlarged front view (b) of the hook device according to Embodiment 2. The hook device 1A of Embodiment 2 differs from Embodiment 1 in the structure of the holding part 40A that holds the position of the second stopper 30 when the second stopper 30 is flipped up, and the structure of the holding part 41A that holds the position of the second stopper 30 when the second stopper 30 is lowered. The other configurations are the same as those of Embodiment 1. The phrase "when flipped up" above corresponds to when the second end 31 of the second stopper 30 approaches the hook base 14. The phrase "when lowered" above corresponds to when the second end 31 of the second stopper 30 approaches the hook tip 11.
[0042] The retaining parts 40A and 41A have a ball plunger BP21 provided on the first retaining arm 20 and locking holes BH31 and BH32 provided on the second retaining arm 30. Locking hole BH31 BH32 is sized to engage with the ball of the ball plunger BP21.
[0043] The second stopper 30 has plate-shaped frame portions 30a and 30b located on the left and right sides, and a plate-shaped intermediate portion 30c connecting the left and right frame portions 30a and 30b. The frame portions 30a and 30b are located on both the left and right sides of the first stopper 20, and are arranged so that a portion of them overlaps with the first stopper 20 and rotates. The intermediate portion 30c is positioned so as to contact the hook tip portion 11 when the second stopper 30 rotates.
[0044] The ball plunger BP21 is provided such that the tips of the balls protrude from the left and right sides of the first stopper 20, and the balls can contact the frame portions 30a and 30b of the second stopper 30 from the inside.
[0045] The locking holes BH31 of the second retaining arm 30 are provided in the left and right frame sections 30a and 30b, respectively. Another pair of locking holes BH32, located in different positions, are similarly provided in the left and right frame sections 30a and 30b, respectively. One of the locking holes BH31 is positioned so that the tip of the ball of the ball plunger BP21 engages when the second retaining arm 30 is flipped up. The other locking hole BH32 is positioned so that the tip of the ball of the ball plunger BP21 engages when the second retaining arm 30 is lowered.
[0046] With the configuration of the holding parts 40A and 41A described above, the relative position of the second retainer 30 with respect to the first retainer 20 can be maintained by the engagement of the tip of the ball when the second retainer 30 is flipped up and when it is lowered. Furthermore, the above holding can be released by applying a rotational force to the second retainer 30 that disengages the ball plunger BP21.
[0047] Note that the arrangement of the ball plunger BP21 and the locking holes BH31 and BH32 is not limited to the above example. For example, the ball plunger BP21 may be provided on the second stopper 30, and the locking holes BH31 and BH32 may be provided on the first stopper 20.
[0048] As described above, the hook device 1A of Embodiment 2 provides the same effects and advantages as the hook device 1 of Embodiment 1 with the same configuration as the hook device 1 of Embodiment 1. Furthermore, with the hook device 1A of Embodiment 2, the configuration of the holding parts 40A and 41A allows the position of the second retainer 30 to be maintained in fewer steps after rotating the second retainer 30, thereby improving the workability of attaching the wire W to the hook device 1A.
[0049] (crane) Figure 6 shows a crane 200 according to an embodiment of the present invention. The crane 200 of this embodiment includes a hook device 1 for lifting loads, a wire rope W100 connected to the hook device 1, a winch 210 capable of winding up and unwinding the wire rope W100, and a moving mechanism 230 that allows the wire rope W100 to be lowered via a point sheave 221 at its tip and also allows the position of the point sheave 221 to be moved horizontally. The hook device 1 may be replaced with the hook device 1A of Embodiment 2.
[0050] In the example in Figure 6, the crane 200 is a crawler crane having a traveling body 240 and a slewing body 231 and a jib 232 as the moving mechanism 230. The crane 200 may be any type of mobile crane, such as a wheel crane, truck crane, rough terrain crane, or all-terrain crane. Furthermore, the crane 200 may be any type of crane, such as a tower crane, overhead crane, jib crane, retractable crane, stacker crane, gantry crane, or unloader. Moreover, the crane 200 may have any configuration in which the object is lifted by the hook device 1, such as a power shovel in which the hook device 1 is connected to the arm via a wire rope.
[0051] The embodiments of the present invention have been described above. However, the present invention is not limited to the embodiments described above. For example, as a holding part for holding the second stopper, a configuration was shown having holding parts 40, 40A that hold the second stopper in an upright position and holding parts 41, 41A that hold the second stopper in a lowered position. However, the holding parts 41, 41A that hold the lowered position may be omitted, and instead of the holding parts 41, 41A, a biasing component such as a torsion spring that biases the second stopper in the direction of closing the hook opening 13 may be provided. Also, in the above embodiments, the holding part was shown to consist of a pin hole and a pin, and a ball plunger and a locking hole. However, the holding part can employ various configurations, such as a configuration that uses the attractive action of magnets to hold the position of the second stopper. Also, in the above embodiments, a configuration was shown in which the second stopper 30 is movably supported by the first stopper 20 and can be held by the first stopper 20. However, the second stopper 30 may be supported in a movable state on the hook body 10, or it may be configured to be retainable on the hook body 10. Furthermore, in the above embodiment, a configuration in which the first stopper 20 and the second stopper 30 are rotatable was shown. However, the first stopper 20, the second stopper 30, or both thereof may be supported in a manner that allows rotation and translation along a predetermined path. Also, in the above embodiment, a configuration was described in which the hook tip 11 is applied as the first part and the hook base 14 is applied as the second part, and the first stopper 20 and the second stopper 30 are provided to satisfy the relative arrangement of the first and second parts. However, the hook base 14 may be applied as the first part and the hook tip 11 as the second part, and the first stopper 20 and the second stopper 30 may be provided to satisfy the same relative arrangement as in this embodiment in relation to the first and second parts. In other words, the pivot axis 28 of the first stopper 20 may be provided at the hook tip 11, and the first end 21 of the first stopper 20 and the second end 31 of the second stopper 30 may be provided so as to abut against the hook base 14. In this configuration as well, the wire W can be attached to and detached from the hook device 1 with good workability, similar to the above embodiment.Furthermore, details shown in the embodiments can be modified as appropriate without departing from the spirit of the invention. [Explanation of symbols]
[0052] 1. 1A Hook device 10 Hook body 11. Hook tip (Part 1) 12 Hanging part 13 Hook opening 14. Hook base (Part 2) 141 Joint section 20 First miss stop 21 First end 24 Joint section 27 Protruding section 28 rotational axes 30 Second miss stop 31 Second end 30a, 30b Frame section 30c Intermediary Department 38 rotational axes 40, 41, 40A, 41A holding part BH31, BH32 locking hole BP21 Ball Plunger H21, H31, H32 pin holes P1 Pin L1, L2 minimum distance W Wire (Rope) W100 Wire Rope R1 Region where the second stopper is located R2 Region where the second stopper is located 200 cranes 210 winch 221 Point Seeves 230 Moving mechanism 231 Rotating body 232 Jib 240 running units
Claims
1. A hook body having a hook tip, a hanging portion on which a rope is attached, a hook opening through which the rope is passed from the outside to the hanging portion, and a hook base located on the opposite side of the hook tip, with the hook opening in between. A first stopper capable of preventing the rope from moving outward from the hanging portion when positioned at the hook opening, A second stopper capable of preventing the rope from moving from the outside to the hanging part when positioned at the hook opening, Equipped with, When one of the hook tip and the hook base is referred to as the first part, and the other as the second part, The second stopper is such that the second stopper end, which is one end in the longitudinal direction, is movable from the side closer to the first part, passing on the opposite side of the hook, and approaching the second part. Furthermore, The device includes a retaining portion capable of holding the second retaining end when it is close to the second portion. Hook device.
2. The first part is the tip of the hook, and the second part is the base of the hook. The hook device according to claim 1.
3. The first stopper is such that the first stopper end, which is one end in the longitudinal direction, is movable from the side closer to the hook tip, through the hooking side, and approaching the hook base. With the first stopper end approaching the hook base and the second stopper being held by the retaining portion, the second stopper is located on the opposite side of the hooking portion to the longitudinal 1 / 3 of the first stopper end. The hook device according to claim 2.
4. With the first retaining end approaching the hook base, and the second retaining end being held by the retaining portion, The minimum distance between the second stopper and the tip of the hook is greater than the minimum distance between the first stopper and the tip of the hook. The hook device according to claim 2.
5. The second retainer is rotatably supported by the first retainer via a pivot shaft, The pivot axis is located on the opposite side of the first retaining end from the longitudinal half of the first retaining, The hook device according to claim 2.
6. With the first stopper positioned at the hook opening, the first stopper has a joint portion that extends toward the hook tip portion than the connection portion with the hook base, and the pivot shaft is positioned at the joint portion. The hook device according to claim 5.
7. A crane having a hook device according to any one of claims 1 to 6.